JP3122068B2 - Backstay positioning device for crane high mast - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positioning device for a backstay in a high mast of a crane, and more particularly to a high mast of a crane in which the assembling workability in assembling the high mast and the safety thereof are ensured. The present invention relates to a backstay positioning device.

[0002]

2. Description of the Related Art A procedure for assembling a back stay in a conventional high mast of a crane will be described with reference to FIGS. In FIG. 7, reference numeral 1 denotes a gate-type high mast provided at the rear of the crane boom. The high mast 1 includes an upper strut 2 integrally fixed by a horizontal member, and a pair of right and left right struts connected to the upper strut 2. The front end 3a of the back stay 3 and the front end 2a of the upper strut 2 are rotatably connected by pins 4. A pin hole 5 is formed in the base end 2b of the upper strut 2, and a pin hole 7 is formed in the lower lug 6 provided near the base end 2b of the upper strut 2. Have been.

On the other hand, near the distal end 3a of the back stay 3, there is provided a fixing pin 8 for changing the length of the back stay 3 in several steps and fixing the same. A pin hole 9 is formed in the portion 3b.

When assembling the high mast 1 and attaching it to a crane, first, the length of the back stay 3 is reduced to a minimum and fixed by the fixing pin 8, and then provided on the base end 2 b of the upper strut 2. Bridle storage link 10 and the upper strut 2
The high mast 1 is lifted by a crane 13 by locking the wire 12 to a bail attachment link 11 provided at the tip 2a of the vehicle.

Thus, as shown in FIG. 8, the upper strut 2 is in a horizontal state and the back stay 3
, And the high mast 1 is lifted in an inverted L-shaped posture. Then, the pin hole 9 formed in the base end portion 3b of the back stay 3 and the lug 15 provided at the rear of the upper revolving unit 14 of the crane face each other, and the pin 16 is inserted. It is pivotally attached to the upper swing body 14. Subsequently, the crane 13 is lowered slightly, and as shown in FIG. 9, a lug (not shown) provided on the roman strut portion 17 of the upper revolving unit 14 and a pin opened in the base end 2 b of the upper strut 2. Hole 5
And the upper strut 2
At the rear of the upper swing body 14.

After that, the other end of the gantry lifting cylinder 18 provided near the base end of the romant 14 is connected to the lower lug 19 of the upper strut 2, and then the sling is removed to store the bridle. Link 10 is stored.

When the gantry lifting cylinder 18 is extended after the high mast 1 is attached to the upper swing body 14 of the crane, the tip 2a of the upper strut 2 stands up with the back stay 3. , The high mast 1 is in the working posture.

[0008]

In a conventional high mast assembly, an upper strut and a back stay rotatably connected by a pin are lifted and lifted by a chain block, a crane, or the like, and are mounted on the base end of the back stay. After the opened pin hole is opposed to the rear lug of the upper revolving structure, and the pin is inserted and pivoted, the pin hole opened at the base end of the upper strut is opposed to the lug of the roman strut. Insert and pivot. Therefore, it is necessary to perform the positioning of the pin holes at the two places on the back stay side and the upper strut side, and at the same time, the high mast is shaken during the work, so that there is a problem in terms of work safety and work efficiency.

[0009] In view of the above, technical problems that need to be solved in order to simplify the operation of assembling the high mast to improve the work efficiency and to improve the work safety arise. The present invention solves this problem. The purpose is to do.

[0010]

SUMMARY OF THE INVENTION The present invention has been proposed in order to achieve the above-mentioned object, and is provided at the distal ends of left and right upper struts provided at the rear of a crane boom, from the rear of the upper struts. In a crane high mast comprising a pair of left and right back stays rotatably connected to a tip end thereof, and a base end of the upper strut and a base end of the back stay connected to a main frame of an upper revolving structure, respectively. A means for restricting the rotation angle of the back stay is provided so that the upper strut and the back stay are connected in a fixed posture, and a positioning stopper is provided on the main frame, and a base end side of the upper strut is provided. When positioning the back stay on the main frame, the base end of the back stay is automatically positioned on the main frame. The Haimasuto the configured crane as determined there is provided a positioning device in the backstay.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 shows a crane 20, in which a boom 22 is attached to the front part of an upper swing body 21 so as to be able to rotate back and forth, and a top sheave 23 and a guide sheave 24 are pivotally attached to the tip of the boom 22 to attach a hook rope 25. It is wound and the hook 26 is suspended. A winch unit (not shown) provided on the upper swing body 21
Thereby, the hook rope 25 is lowered and the hook 26 is moved up and down.

On the other hand, a gate-shaped high mast 27 is provided at the rear of the upper revolving superstructure 21.
The upper strut 28 includes left and right upper struts 28 pivotally attached to a rear portion of the boom 22 and a pair of left and right back stays 29 for supporting a distal end portion 28a of the upper strut 28 from behind.

Further, one end of a pendant rope 30 is fixed to the end of the boom 22 so that the pendant rope 30
A bridle 31 is connected to the other end of the winch unit, and a bail 32 is pivotally attached to the tip end 29a of the back stay 29. Connect to

On the other hand, the distal end of a gantry lifting cylinder 34 is connected to the vicinity of the proximal end 28b of the upper strut 28, and the proximal end of the gantry lifting cylinder 34 is omitted from the drawing. Connects to a portal connection pivoted to section 28b.

FIG. 2 shows the high mast 27. The high mast 27 includes the upper strut 28 and the back stay 29 for supporting a tip 28a of the upper strut 28 from behind. In the vicinity of 29a, there is provided a fixing pin 40 which can fix the back stay 29 by changing the length of the back stay 29 in several steps, so that the back stay 29 can be extended and contracted. Therefore, the inclination angle of the upper strut 28 can be freely changed by expanding and contracting the length of the back stay 29.

Next, the upper strut 2 shown in FIG.
8 and the back stay 29, respectively. 29a
(Part A in the figure) is shown in FIG. In the same drawing, a small-diameter long hole 41 is formed in the front end portion 29a of the back stay 29, and a slightly large-diameter pin hole 42 is formed in the vicinity of the front end portion 29a. A pin hole 43 having a small diameter is formed in the tip portion 28a of the upper strut 28, and a pin hole 44 having a slightly larger diameter is formed in the vicinity of the tip portion 28a.

As will be described later, the tip 28a of the upper strut 28 and the tip 2 of the back stay 29
9a are brought into contact with each other so that the pin holes 44 and 42 are opposed to each other.
3 are formed so as to have the same diameter.

On the other hand, as shown in FIG. 2, a bridle storage link 45 is provided on an upper portion of the upper strut 28 near the base end portion 28b.
A pin hole 46 is formed in 8b. Further, a pin 49 is inserted into the upper strut 28 so that the pin hole 48 formed in the upper part of the portal type connecting portion 47 and the pin hole 46 of the base end 28b of the upper strut 28 face each other. The base end portion 28b is connected to the portal-shaped connecting portion 47.

The brackets 51, 52 fixed to the main frame 50 of the upper rotating body 21 are provided with pin holes 53, 54, respectively.
In the lower part of the bracket 4, the base ends of the legs 47a, 47b of the gate-shaped connecting part 47 are lowered at the time of assembling the high mast 27, which will be described later. Stopper bolts 55, 56, 57, 58 for positioning the legs 47a, 47b are provided at predetermined intervals. Pin holes 59 and 60 are formed in the legs 47a and 47b, respectively, and the other end of the gantry lifting cylinder 34 provided in the legs 47b is connected to a lower lug 61 of the upper strut 28. It is connected to the.

On the other hand, the base end 29 of the back stay 29
The b is provided with a pin hole 62, and a bracket 63 that can be connected to the pin hole 62 so as to face the pin hole 62 is fixed to the main frame 50. A pin hole 64 is formed in the upper left portion of the bracket 63, and a base end portion 29b of the back stay 29 descends by its own weight below the pin hole 64 when the high mast 27 is assembled. Positioning stopper bolts 65 and 66 are projected from the bracket 63 so as to be guided to the upper left side. Further, a substantially triangular slide portion 67 having a curved portion on the upper side is fixedly provided on the right side of the bracket 63, and the base portion 29b of the back stay 29 is fixed to the upper curved portion of the slide portion 67. The slide surface 68 is formed so that the slide surface slides and is guided to the upper left part of the bracket 63.

Next, a method of assembling the high mast 27 will be described with reference to FIGS. In FIG. 3, the tip portion 29a of the back stay 29 is inserted into the slit portion 28c near the tip portion 28a of the upper strut 28, and the pin 69 is inserted with the two pin holes 42 and 44 facing each other. The upper strut 28 and the back stay 29 are rotatably connected. Subsequently, the pin 70 is inserted into the elongated hole 41 formed in the tip portion 29a of the back stay 29 so as to face the pin hole 43 formed in the upper strut 28. 70 rotates together with the pin 70 and the pin 70 can move only the length of the long hole 41 in the long axis direction, so that the rotation angle of the back stay 29 with respect to the upper strut 28 is within the moving range of the pin 70. Be regulated. Therefore, the posture of the back stay 29 and the upper strut 28 is kept substantially constant.

The rotation angle regulating means of the back stay 29 is not limited to the use of a pin, but may be a plate, for example. Thereafter, the high mast 27 is lifted by a crane or the like using the bridle storage link 45 provided on the upper strut 28 and the pin 69. As shown in FIG. 4 (a), the brackets 51 and 52 are
When the high mast 27 is lowered by the crane after the legs 47a and 47b of
a, 47b descend to the brackets 51, 52. Thus, as shown in FIG.
a and 47b are positioning stopper bolts 55, 56, 57 and 58 projecting from the brackets 51 and 52, respectively.
The two pin holes are guided so as to face each other and stop. Therefore, the pin hole 59 exactly matches the pin hole 53, and the pin hole 60 is
4, the pins 47 are inserted into the respective pin holes 59, 53 and 60, 54.
The positions of a and 47b are determined, and the legs 47a and 47b are connected to the main frame 50.

At this time, the back stay 29 connected to the distal end portion 28a of the upper strut 28 has the pin 70 abutting on the upper end of the elongated hole 41 to restrict the rotation angle as described above. As shown in FIG. 5A, the base end 29b of the back stay 29 is
Come to. Then, when the high mast 27 is lowered by the crane, the base end 29b of the back stay 29 slides on the slide surface 68 by its own weight toward the upper left portion of the bracket 63 as shown in FIG. Descending, the stopper bolt 6 for alignment
The pin holes 62, 64 are guided by the pins 5, 66 so as to face each other and stopped.

Thus, the pin hole 64 formed in the bracket 63 and the pin hole 62 formed in the base end portion 29b of the back stay 29 exactly coincide with each other, and both pin holes 62, 64 are formed. When the pin 73 is inserted, the position of the back stay 29 is determined, and the back stay 29 is pivotally connected to the main frame 50 so as to be freely rotatable.

That is, the leg portion 47 of the portal type connecting portion 47 connected to the base end portion 28b of the upper strut 28
a, 47b are brought closer to the brackets 51, 52, and the pin holes 59, 60 are aligned with the pin holes 53, 54 so as to be pin-coupled.
8 and the back stay 29 are held in a substantially constant posture, so that the pin hole 62 formed in the base end portion 29b of the back stay 29 is automatically inserted into the pin hole 64 formed in the bracket 63. Is positioned.

The stopper for positioning the back stay 29 is not limited to the use of a stopper bolt, but may be a plate, for example. Thus, the high mast 27 is assembled to the main frame 50 as shown in FIG. At the time of work, a fixing pin 40 provided on the back stay 29 is provided.
, And the gantry lifting cylinder 34 is operated to raise the upper strut 28. At this time, the front end 29a of the back stay 29 is pulled up, so that the length of the back stay 29 is extended. Thus, the high mast 27 is connected to the upper strut 28
While keeping the angle between the and the back stay 29 constant,
The high mast 27 is fixed in a predetermined working posture by standing up with the pins 49 and 73 as fulcrums and subsequently inserting the fixing pin 40 again to fix the length of the back stay 29.

The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0028]

As described above, when assembling the crane high mast to the main frame, the rotation angle of the back stay is adjusted so that the upper strut forming the high mast and the back stay are connected in a substantially constant posture. In addition to providing a restricting means, a positioning stopper is provided on a bracket connecting the upper strut and the base end of the back stay, so that the base end side of the upper strut is positioned on the bracket of the main frame. Then, the base end of the back stay is automatically positioned on the main frame.

[0029] Thus, the base end of the high mast can be connected to the main frame by a single alignment.
The work load on the assembly worker can be reduced, and work safety can be improved.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is a side view of a crane.

FIG. 2 shows an embodiment of the present invention and is an explanatory diagram of a high mast.

FIG. 3A is a plan view showing a state in which a back stay and a distal end of an upper strut are connected. FIG. 3B is a sectional view taken along line BB of FIG.

FIG. 4A is an explanatory view showing a state before connecting a gate-shaped connecting portion to a bracket. (B) Explanatory drawing which shows the state which connected the portal connection part to the bracket.

FIG. 5A is an explanatory view showing a state before a base end of a back stay is connected to a bracket. (B) Explanatory drawing which shows the state which connected the base end part of the back stay to the bracket.

FIG. 6 is an explanatory view showing a state where the high mast is assembled to the main frame.

FIG. 7 is an explanatory diagram of a conventional high mast.

FIG. 8 is an explanatory view of assembly of a conventional high mast.

FIG. 9 is an explanatory view of assembly of a conventional high mast.

[Explanation of symbols]

Reference Signs List 20 Crane 21 Upper revolving structure 22 Boom 27 High mast 28 Upper strut 28a Tip 28b Base end 29 Back stay 29a Tip 29b Base end 50 Main frame 55, 56, 57, 58, 65, 66 Stopper bolt

Claims (1)

(57) [Claims] 1. A pair of left and right back stays are rotatably connected to the tips of left and right upper struts provided behind a crane boom from the rear of the upper struts. And a high mast of a crane having a base end of the back stay connected to a main frame of an upper revolving structure, wherein the upper strut and the back stay are connected in a fixed posture. A means for regulating the rotation angle is provided, and a positioning stopper is provided on the main frame, and when positioning the base end side of the upper strut to the main frame, the base end of the back stay is connected to the main frame. Crane high mast characterized by being automatically positioned Backstay positioning device.